As far as setups go, I would go with something like:
MM ESC
Castle BEC
RCM motor mount
Feigao 7 or 8XL
TrueRC 4S2P 8000mah pack
Tekno kit minus the motor mount
and the various odds and ends.
Personally, I would leave it 2 speed. That, with a Traxxas center diff kit and rear brakes would make for a killer setup. Thats what I'm gonna be running. I'm just waiting on my MM to get back from CC.
Yeah leave the 2 speed and mech brakes. It really works well like that. You may even be able to get away with a feigao 10l on 4s lipo and use the clutch provided with the tekno kit. I am running a similar sized aveox motor and it is fine, stays cool enough and can wheely on demand!